Moisture desorption observations from two bentonite clay mats subjected to ten 26 environmental zones with individually different combinations of laboratory controlled constant 27 temperatures (between 20⁰C to 40⁰C) and relative humidity (between 15% to 70%) are presented. 28These laboratory observations are compared with predictions from mathematical models, such as 29Thin-layer drying equations and kinetic drying models proposed by Page, Wang and Singh, and 30Henderson and Pabis. The quality of fit of these models is assessed using standard error of 31 estimate, relative percent of error and coefficient of correlation. The Page model was found to 32 better predict the drying kinetics of the bentonite clay mats for the simulated tropical climates. 33Critical study on the drying constant and moisture diffusion coefficient help to assess the efficacy 34 of a polymer to retain moisture and control desorption through water molecule bonding. This is 35 further substantiated with the Guggenheim-Aderson-DeBoer (GAB) desorption isotherm model 36 which is presented. 37 38